Denture press



Allge 9, 1932. I a UNDERDAHL 1,871,137

DENTURE PRES S Filed Aug. 17,' 1928 z sheets-sheet 1 By mi Aug- 9, 1932 B. UNDERDAHL 1,871,137

DENTURE PRES S Filed Aug. 17, 1928 2 Sheets-Sheet 2 Patented Aug. 9, 1932 BIRGER UNDERDAHL, OF PORTLAND, OREGON DENTURE PRESS Appncaaon nea August 17,1928. serial No. 300,325.

The general object of my said invention is the provision of a denture press, simple and sturdy in construction, and susceptible of ready and efcient manipulation to assure the production of accurate results.

To the attainment of the foregoing, the invent-ion consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, forming a part of this specification: 1

Figure 1 is an elevation of the 'preferred embodimentof my invention.

Figure 2 is a view of the same, partly in diametrical section and partly in elevation,

Z the flask frame being partly in elevation and the two flasks shown in combination with the frame as part of my invention being shown entirely `in elevat-ion.

Figure 3 is an enlarged detail elevation 'of the press base per se.

Figure 4 is an enlarged detail horizontal section taken in a plane below the head of the flask frame, looking upwardly and showing the pendant studs on the boiler cover for accurately positioning and centering the flask frame. i

Figure 5 is an enlarged horizontal section taken through one of the flasks.

i Figure 6 is a horizontal section taken through the complete press in a horizontal plane above one of the flasks and showing the positioning of the flask in the flask frame and the manner in which casual displacement of the flask from the frame is prevented, due to co-action between the flask and one of the said uprights of the flask frame.

Figure 7 is an enlarged fragmentary diametrical section of one of the flasks showing the manner in which the lugs of the flask sections are interlocked. v

Similar numerals of reference designate corresponding parts in all of the views of the drawings. The boiler l1 of the press is prefr erably formed of aluminum appropriately embellished by nickel plating or otherwise,

vand it is open at its upper end and is provided with a bottom 2 below its lower end. l The portion of the boiler 1 below the bottom 2, in the present embodiment of my invention, is

5 provided with apertures 3, for the admission of air to support combustion and for the emisf sion of products of combustion. The said boiler 1 is provided, in its lower end with recesses l designed to receiveupstanding proje'ctions 5 on the base 6, Figures 1, 2, and 3, whereby when the boiler 1 is rested with its lower end on a shelf'? of the base 6, the boiler 1 and the base 6 will be interlocked and turning of the boiler 1 about its axis with respect to the base 6 will be prevented Notwithstanding this, however, it will be manifest, that the boiler 1 may be expeditiously and easily lifted from the base 6 and may as readily be replaced on and interlocked with the base 6. Said base 6, in addition to a body 8, characterized and just described, includes legs 9 and is equipped with an appropriate gas burner 10. i l

Manifestly, within the purview of -my invention, an electric heating element may beV employed in lieu of the gas burner 10 as -anappurtenance of the base 6 and when the electric heating member is employed, the apertures 3 in the lower end of the boiler 1 may be either employed or altogether omitted in the discretion of the manufacturer of the press. The cover for the boiler 1 is designated by 10 and itis preferablyalthough not necessarily, equipped with a safety valve 1 1, a thermometer 12 and a pet cock 13, all. in communication with the interior of the boiler 1. The pet cock 13 is provided, by prefer-ence, in, order that an operator by opening the pet cock 13 may be sure that the interior of the boiler 1 is practically free of steam, before the cover 10 is removed. Y

vThe saidcover 1() is provide-d witha pend- Y ant flange 14 that is designed to fit snugly i in the upper end of the boiler 1 and lis also provided with ay central aperture 15, Figure 2.

Y The flask frame of Vmy improvement is' designated by 16, and it is provided in its upper end portion or head 17 with a threaded aperture 18 to receive the pendant threaded portion of astud 19, which is flanged at 20 to bear on the upper side of thecover 1Q and is interiorly threaded at 21V and is exteriorly threaded atits upper end to 'receive an apertured gland 22, in which is a packing an-V nulus 23.

In order to'center and properly position the flask frame 16, the cover 10 is provided withpendant projections 24, Figure 4, designed to cooperate with opposite edges of the head 17 in which edges are seats 25, wherebyv as will be readily apparent the flask frame 16 may be accurately centered and po sitioned for the reception of the pendant threaded portion of the nutv1'9.. -Itwillalso be understood that the co-action between the llask frame 16 andthe projections 24 willfpreclude turning of the flask frame 16 abouty its axis and in that way will prevent shifting in `position of the flask frame whenv the parts are assembledrandV connected as shownl 1nV Figure 2.: Y I' Extending through an-d` engaging the nut -19 is ascrew stem.26,to the lower end-.of which is connected by :apawl and. socket joint. a follower plate 27, '(Figure] 2) At its upper end,.the stem or shaft 26 is provided withra handle 27which'may be of thevform-illustrated or any otheriform compatible with-the purposes of my invention.

The cover l10 may be securedv onthe boiler bodylin any appropriate manner. Lprefer, however,.to employ for the Ypurpose the swingable'bolt28, pivotally connected at29, tojflugs ontheboiler body 1 and adapted, when swungtothe vertical positions shown in` Figure 1 to enter bifurcations in projections 30 on the cover 10. The said bolts. `28 are equipped with Ywing nuts 31, Figure 1, andrwhen. the bolts are positioned, as shownvinY Figure 1, 'the said wing nuts 31 are designed to be turned. down tight on the coverl .10so. as to bring. about a tight or hermetic closure of the boiler.V Y I .Y y. Y,

Inaddition to the head 17, the V.flask .frame 16 which is preferably formed in onepiece of appropriate metalincluldesa bottonnplate 32, spaced'considerably below. the head 17, and upright ba-rsv33 and 34int`erposed between and. adj Dining. the head and bottom plate4 and spaced apart (Figuref2). The upright bar 33 is peculiar and advantageous inthat it is provided'at one ofV its `vertical edges with an inwardly directed lip 35,4Figures 4 and 6, for an important purposeV presently 'pointed out.

Y In the illustrated embodimentofmy inven# tion', two-flasks 36 are shown in superposed Vrelation in the frame 1:6,ftlioi`1gh I' would have it understood' that any'V desiredl number of the flasks 36r may be so'employed. yIii-this connection, it will also be understood that the flask frame; 16'1nay 'be made of any' desired length asmay also the boiler 1.Y The flasks 36V are identical in construction,and'therefore a detailed description ofthe flasks shown in Figures 5, 6', and7 'willsuflice to impart a definite understanding of both or all flasks 36. The flask specially alluded toincludes a lower section 4Q and an upper section.l 41;, the Y -of thel flask- Vbe so relatively arranged that when the flasks are superimposed in the frame 16, ventapertures such as described will rest atoppovsite sides ofthe lips 35 on the uprights 33 of the flask frame 16. See in this connection the dottedlines representing the said apertures in Figurev6=of the drawings.

' vThebottom. section 40 of the special flash referred to, is shown in plan Figure 5, and,

from said ligure it will be understood that there'are many of the vent apertures suchzas"V described in the side of the flask. yIt will also be understood that the section 40 is provided? exteriorly with-lug seats '44, the interiors of which are of concaved formin horizontal section'- as designated at 45 in Figure 5. 'The-'up-V per section 41 of the flask referred to is pretjerably provided in: its top with ventapertures 46, (Figures' and 7 ltwillbealso noted: that thesaid'section 41 is provided ati opposite points #with exterior projections y47 and that said projections-47 carry pendant tongues 48, which are tapered-'toward their lower'ends, as are also the seats'45, before referred to. Y' 1 I would also have itV under-stood that the faces ofthe 'tongues 48 are of convex form in horizontal sectioni as designated by 49, in'v Figure 5.

By virtue of the peculiar form of pendent tongues 48 and the lug seats '45 it will be understood that whenthe section! 41 is spaced above' the section 40-with` the'lowerA endportions ofthe tongues 48`in theu-pper ends of the-seats 45,;thesection 41 may be' rocked 'or manipulated with respect Vto the: section40. W'hen, howeverythe section4-1-isv moved-down tight on `thefsection. 40,V` the tongues 48-will be snugly. disposedintheseat 45' after the manner of' a wedge action, and in consequence the sections 40 and' 41 will.

exudation of plaster of Paris or other material yfrom the iiask through said apertures, there ijs no liability of anyof theplasterof Paris or other material getting on thelip 35 of the flask'framebar 33.

Vhen the 'flasks36are positioned in super'- imposed relationlinV thea-frame 16,. Figure 2,`

the

and the stem or shaft26 is turned about its axis to impose pressure through the follower plate 27 on the flask 36, the tendency is to move the flash in the direction indicated by the large arrow in Figure 6.

It will be appreciated, however, from Figure 6, that when the action indicated takes place, the convex sides of the flasks, cooperating with the lip 35 of the upright 33 and the concaved sides of the flasks cooperating with the frame bar 34 will absolutely prevent material shifting or movement of the flask in the frame 16, which is a highly important advantage.V It will be noted, however, in this connection, that when the boiler is opened, and the frame and flasks are removed, from the boiler body l, movement ofthe flask in the direction opposite to that indicated by the large arrow in Figure 6 will bring about removal of the flask from the frame 16, and then, as will be readily understood, the flask sections may be expeditiously and easily disconnected for access to the interiors of the flasks.

In practice, not only the boiler l, but all of the other exposed parts of my no-vel press are preferably, although not necessarily nickel-plated` or otherwise embellished in order to enhance the finished appearance of the press as a whole.

I have specifically described the preferred embodiment of my invention, in order to impart a full, clear and exact understanding of said embodiment and all of its details.

I do not desire, however, to be understood, as limiting myselfto the structural details illustrated, my invention being defined by my appended claims, and within the scope of which modifications may be made without departure from my invention.

I claim:

l. In a denture press, and in combination, a flask frame having spaced upright bars, one with an inwardly directed lip extending from one of its upright edges, and a aslr for removable arrangement in said frame, the flask concaved at one side for opposition to and reception of one upright bar of the frame and convex at its opposite side for opposition to and cooperation with the lip. on the other bar of the frame.

2. In a denture press, and in combination, a boiler open at its upper end, an apertured cover for the boiler,'means for detachably securing the cover on the boiler, a nut extending below and above the cover and supported thereby, a threaded stem or shaft extending through and engaging said nut, a follower plate carried by said shaft, aflask frame threaded on said nut and held against extending through and engaging said nut, a

follower plate carried by said shaft, a flask frame threaded on said nut and held against turning about its axis to the cover and having opposite recesses and also having spaced upright bars, one with an inwardly directed lip extending from one of its vertical edges, and flasks for removable arrangement in said frame below said follower plate, the

'flasks being concaved atl one side for opposition to one upright bar of the frame and convex `at the opposite side for opposition to and cooperation with the lip on one bar of the frame, the said holding of the flask frame against turning about its axis relatively to the cover being effected byV pendent projections on the cover co-acting with said opposite recesses in the fiask frame.

il. In a denture press, and in combination, arflask frame having spaced upright bars, one with an inwardly directed lip extending from one ofits vertical edges and a flask for removable arrangement in said frame, the flask concaved at one side for opposition to and reception of one upright bar of the frame and convex at its opposite side for opposition to and cooperation with the lip on said bar of the frame, and the said flask made up of superimposed sections with vent forming notches in their meeting apertures and the said notches so relatively arranged that two of the same will rest at opposite sides of the ICQ said lip on the frame bar when the 'flask is i positioned in the frame.

In testimony whereof I aiix my signature.

BIRGER UNDERDAHL.

turning about its axis `to the cover and having spaced upright bars, one with an inwardment in said frame below said follower plate,

iis` 

